Data Structures
struct	VPIHarrisCornerDetectorParams
	Structure that defines the parameters for vpiSubmitHarrisCornerDetector. More...

Functions
VPIStatus	vpiInitHarrisCornerDetectorParams (VPIHarrisCornerDetectorParams *params)
	Initializes VPIHarrisCornerDetectorParams with default values. More...

VPIStatus	vpiCreateHarrisCornerDetector (uint32_t backends, int32_t inputWidth, int32_t inputHeight, VPIPayload *payload)
	Creates a Harris Corner Detector payload. More...

VPIStatus	vpiSubmitHarrisCornerDetector (VPIStream stream, uint32_t backend, VPIPayload payload, VPIImage input, VPIArray outFeatures, VPIArray outScores, const VPIHarrisCornerDetectorParams *params)
	Submits Harris Corner Detector operation to the stream associated with the payload. More...

Detailed Description

Data Structure Documentation

struct VPIHarrisCornerDetectorParams

Structure that defines the parameters for vpiSubmitHarrisCornerDetector.

Definition at line 79 of file HarrisCorners.h.

Collaboration diagram for VPIHarrisCornerDetectorParams:

Data Fields
int32_t	blockSize	Block window size used to compute the Harris Corner score. Must be 3, 5 or 7.
int32_t	gradientSize	Gradient window size. Must be 3, 5 or 7.
float	minNMSDistance	Non-maximum suppression radius, set to 0 to disable it. For PVA backend, this must be set to 8.
float	sensitivity	Specifies sensitivity threshold from the Harris-Stephens equation.
float	strengthThresh	Specifies the minimum threshold with which to eliminate Harris Corner scores.

VPIStatus vpiCreateHarrisCornerDetector	(	uint32_t	backends,
		int32_t	inputWidth,
		int32_t	inputHeight,
		VPIPayload *	payload
	)

This function allocates all temporary memory needed by the algorithm.

Parameters

[in]	backends	VPI backends that are eligible to execute the algorithm. Currently only one backend is accepted.
[in]	inputWidth,inputHeight	Dimensions of the input image that will be used with this payload.
[out]	payload	Pointer to memory where the created payload handle will be written to.

Returns: VPI_SUCCESS if payload was created successfully, some other VPIStatus value in case of error.

VPIStatus vpiInitHarrisCornerDetectorParams ( VPIHarrisCornerDetectorParams * params )

Initializes VPIHarrisCornerDetectorParams with default values.

Default values are:

VPIStatus vpiSubmitHarrisCornerDetector	(	VPIStream	stream,
		uint32_t	backend,
		VPIPayload	payload,
		VPIImage	input,
		VPIArray	outFeatures,
		VPIArray	outScores,
		const VPIHarrisCornerDetectorParams *	params
	)

Submits Harris Corner Detector operation to the stream associated with the payload.

Parameters

[in]	stream	The stream where the operation will be queued in.
[in]	backend	Backend that will execute the algorithm. Must be one of the backends specified during payload creation. If 0, VPI will select one of the eligible backends from the payload that accepts the given parameters, usually the fastest one.
[in]	payload	Payload to be submitted along the other parameters.
[in]	input	Input image from where the Harris corners will be extracted.
[out]	outFeatures	Array that will receive the detected corners. It must have type VPI_ARRAY_TYPE_KEYPOINT.
[out]	outScores	Array that will receive the corners' scores. It must have type VPI_ARRAY_TYPE_U32.
[in]	params	Pointer to a VPIHarrisCornerDetectorParams with parameters for this algorithm invocation. These parameters can vary in every call and will be copied internally, no need to keep the object around.

Returns: VPI_SUCCESS if the algorithm submitted was created successfully, some other VPIStatus value in case of error. Even if VPI_SUCCESS is returned, the actual algorithm execution might still fail, due to invalid parameters. The actual error will only be returned by some synchronization call or another algorithm submission.